the operation of the converter station has been scoped out of any further assessment in this PEIR.
Offshore construction and operation impacts 66. Due to the significant distance of the proposed windfarm from the shore, the construction or operation of the development will not result in any impact to onshore noise receptors and is therefore scoped out of consideration within this chapter.
Decommissioning phase impacts 67.
The decommissioning activities with the potential to have an impact on noise and vibration would be similar to those occurring during the construction phase assuming the infrastructure is removed. As such, the potential noise and vibration impacts associated with the decommissioning phase were assessed qualitatively with reference to the potential impacts associated with the construction phase (albeit likely to be of lower magnitude of effect).
Sensitivity 68.
To identify the significance of any potential noise and vibration impacts the sensitivity of each receptor was considered based on the criteria provided within Table 26.9.
Table 26.9 Sensitivity High Medium Low Negligible Magnitude
Impact magnitude – on-site construction noise 69.
The construction noise criteria presented in Table 26.10 are based on the guidance contained within BS5228. Annex E of BS5228 proposes 65dB LAeq 12hr as a potential daytime construction noise limit, where the existing ambient (LAeq) noise level is itself below 65dB LAeq 12hr. As the majority of locations surveyed within the cable corridor had average daytime LAeq values below 65dB LAeq 12hr , this ‘limit’ was considered an appropriate value to use in this assessment as the threshold level for a negligible magnitude effect. Subsequent impact magnitude thresholds are based
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 26 Noise and Vibration Page 21
Definition of terms relating to the sensitivity of generic receptors Definition
Hospitals (e.g. operating theatres or high dependency units), care homes at night
Residential accommodation, private gardens, hospital wards, care homes, schools, universities, research facilities, national parks, during the day; and temporary holiday accommodation at all times
Offices, shops, outdoor amenity areas, long distance footpaths, doctors surgeries, sports facilities and places of worship
Warehouses, light industry, car parks, agricultural land
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